Dust removal device



Nov. 20, 1934.

T. F. HATCH DUST REMOVAL DEVICE Filed June 16, 1935 2 Sheets-Sheet 1 oofo OOOO'O O OmOu OuO O' O O g @um A1 mums.. 0

' INVENTOR.l Theodore HdM/1 BY l. Y

HLS'A TTORNEY I Nov. 20, 1934. T, F, HATCH 1,981,356

DUST REMOVAL DEVICE Filed June 16, 1955 2 Sheets-Sheet 2 HIS ATTORNEYv Patented Nov. zo, 1934 ENT oFFleE DUs'r REMOVAL DEVICE Theodore F. Hatch, Cambridge, Mass., assignor, by mesne assignments, to Kadco Corporation, New York, N. Y., a corporation of New York Application June 1'6, 1933, seria1N0.v676,036

5 Claims.

i'his invention relates to separators, and more particularly to a dust removal device adapted to remove and lter dust from air whereby it is entrained.

A specific use of the device may be that of removing rock dust from the air used for conveying cuttings from a drill hole.

One object of the invention is to elect a substantial separation of the air and abrasive substances entrained thereby prior to the passage of the air through the final filtering element thereby relieving the load on the latter. r

Another object is to provide a unitary separator and filtering device which is compact and readily portable so that it may at all times occupy a position closely adjacent the source of dust and thereby eliminate the necessity of exposing the conduits, whereby the dust is conveyed, to the abrading action of the dust.

Other objects will be in part obvious and in part pointed out hereinafter.

In the accompanying drawings forming a Dart of this specification and in which similar reference characters refer to-similar parts,

Figure l is a sectional elevation of the dust removal device taken through Figure 2 on the line 1 1 looking in the direction indicated by the arrows and showing the iinal stage separator compartment and the filtering section,y

. Figure 2 is a sectional elevation taken through Figure 1 on the line 2-2 looking in the direction indicated by the arrows,

Figure 3 is a plan view in section taken through Figure 1 on the line 3 3 looking in the direction indicated by the arrows, Y

Figure 4 is a top plan view of the dust removal device, showing the top wall or cover removed,

Figure 5 is a side elevation, partly broken away, of the filtering element, and

Figure 6 is a plan view, partly lin section.

Referring more particularly to the drawings, the dust removal device, constructed in accordance with the practice of the invention, comprises a casing A shown as being of rectangular shape and having an internal wall'B vto separate the interior of the casing into separator and filtering sections C and D, respectively.

In the form of the invention shown, the section C is separated into two compartments E and F by a wall G having an opening H to afford communication between the compartments. The compartment E constitutes the initial stage compartment into which air and dust are drawn from a source, as for instance a drill hole, through an inlet opening J in the side of the casing A. -Withsharply in the compartment E by the baiiie L. As

a preferred form of construction the opening H is of small height as compared with'its width, so that the air, and `the dustremaining therein, will pass from the separator' compartment E in the form of a flat elongated stream.

Disposed within the compartment F, to form a continuation of the opening H, is a nozzle Q having a restricted discharge opening R to cause the air and dust to iiowv into the compartment F in the form of a high velocity jet which impacts against a baille S arranged in front of the nozzle to deflect the air stream downwardly toward the bottom of the compartment F. A considerable portion of the dust remaining in the air stream after its passage through the initial separator stage will, owing to its high kinetic energy, be thus projected into the inactive zone 'I of the compartment F, whence it may be removed through a. gate A at the bottom -of the casing A.

After being deflected downwardly by the baille S the air flows in -a, generally upwardly direction and passes from the compartment F into the ltering section D through discharge openings U in the wall B; said discharge openings U being arranged on opposite sides of the baiile S. portion of the compartment Between the upper F and the inactive or dust storage portion T areva pair of guide plates V which may lie in substantially the same transverse plane as the lowermost end of the baille S and have depending portions W which are suitably spaced with respect to each other to provide an areaway between the upper and lower portions of the compartment F. The lowermost ends X of the depending portions W are preferablycurved outwardly so that any air circulating init/the top portion of the inactive zone of the compartment F will, upon eddying around the curved portions` X, lcarry the particles of dust entrained in 'the air into intimate contact with the under surfaces of the plates V to which a considerable portion of such dust will adhere.

In order to provide a clearly defined pathway for the dust particles flowing into the storage los ' scrubbing action, the

by centrifugal action. There remains frames fmay, as shown, g and the main or outer portions h are preferably space of the compartment i, a series of plates Y are arranged in pairs at different elevations below the baille S. The plates Y of a pair lie on opposite sides of the vertical plane lwherein the depending portion of the baille S is located so that the dust deflected by the baille S is caused to flow downwardly between the baiiles Y against an inclined portion Z of the wall G along which it may slide, upon accumulation, to the bottom of theL compartment.

To the end thaiy air flowing counter to the stream of dust flow ng downwardly between the' baille plates Y may be subjected to a further baille plates Y are each provided at their upperv ends with outwardly curved portions b extending generally in the direction of the adjacent portions W of the plates V. Owingv toy this arrangement the air owing upwardly along the depending -portions W of the plates V will be caused to swirl so that the dust particles will be centrifugally cast against the portions W to which they may adhere until, owing to their collective weight, they will drop into the storage space of the compartment F. The air will then continue, along with the main air stream, through the discharge openings U into the filter section D where it is deflected downwardly by a ported by thewall B and overlying the openings U. As may be readily appreciated, during its course through the separator compartments the air stream is freed of substantially all such dust particles as may be practically` removed therefrom in the airhowever, a residue of nely comminuted dust which, depending upon the nature ofthe rock being drilled, may be decidedly harmful when inhaled and is, in any event; objectionable when discharged into the atmosphere. It is accordingiy contemplated to pass the air/through a ltering device before discharging it from the casing which, in the present instance, takes place through a main outlet opening` d in the cover K and to which the pumping apparatus (not shown) may/be connecte To this end'a filtering element, designate in general by e, is disposed in the filtering section D in such wise that all the air drawn into the filtering section passes through the filtering element during its course to the outlet opening d.

Ihe filtering element-may be of any suitable and well known type. That illustrated comprises a series of frames f depending fromrods g arranged inthe uppermost portion of the section D and upon which the frames f are pivoted. Th@

be of rectangular shape U-shaped in cross section, thus providing a rounded surface for engagement with the filtering fabric y'. 4

On the opposite sides of the frames f and suitably secured to the legs 1c of the portions h of the filtering frames are bars or wires designated, according to groups, as o and p which may be arranged in mutually y perpendicular fashion be'- tween the opposed sections or portions h of the filtering frames. The wires of a group are suitably space'd with respect to each other to assure a minimum of resistance to the air through the filtering fabric :i whileat the same time preventing the portions of the filtering fabric lying on opposite sides of the frame from collapsing or being drawn together.

The filtering fabric may, as is customary, con sist of a single piece formed into a series of pockets q. At the lower ends of the pockets q baiile csupy flow between the baiiles .portion R of the nozzle at highly are grommets 1"' carrying links s for engagement with hooks t of springs u mounted upon a shaker rod v. The shaker rod v, which lies beneath the filtering frames, is slidable in the walls of the casing for shaking the pockets q to remove accumulated dust therefrom.

Near the -upper end of the bags q is an outwardly flared portion or skirt w having its outer edges clamped between a pair of sealing rings :c and y which are pressed against a flange z in the filter section D by screws 2 threaded into a flange 3. n

I'he operation of the device, briefly described, is as follows: After passing through the opening J into the compartment E the air and dust are deected downwardly by the baiile L and, upon curling around the end of the baille, the heavier dust particles are hurled from 4the air stream to the bottom of the compartment. The air and entrained dust then pass through the restricted y accelerated velocity so that, upon impacting against the plate S whereby the air stream is deflected downwardly, the dust particles are cast through the areaway between the baille plates Y against the inclined portions Z of the wall G.

Obviously a portion of the air will be caused to Y and, in practice, it has been found that some air also circulates around the vicinity of the lowermost bailies Y. These air currents circulating ir. the compartment F intercept dust particles which would ordinarily be again returned to the main air stream to be carried thereby to the filtering section D. In the arrangement shown, however, the air and dust issuing from the inactive zone of the compartment F return to the main air stream through the spaces existing between the portions W of the plates V and the baie plates Y.

During lits upward course the air is caused to follow a swirling motion by the curved portions b of the baffle plates Y so that a considerable portion of the dust contained in the air is centrifugally cast therefrom or is brought into intimate contact with thesurfaces of the plates W 120 and the baiile plates Y to which it adheres. The air then continues its upward motion and passes from the flnal separation compartment with the main air stream.

Upon entering the filtering section D the air 125 is deflected downwardly by the baffle c, then passes through the filtering fabric at a low velocity to effect removal of the remaining dust particles. After passing through the filtering fabric the strained air passes through the outlet opening-d. 130 and may again be discharged into the atmosphere in a hygienically safe condition.

I claim:

1. A dust removal device comprising a casing having a separator compartment through which dust laden air ows, said compartment having inlet and outlet openings, a nozzle forming a continuation of the inlet opening and having a restricted portion to accelerate the velocity of the air flowing into the compartment, a baille to deect the air stream issuing from the nozzle for casting dust from the air stream, and curved plates in the compartment arranged at different elevations to cause a swirling motion of the air owing to the outlet opening for centrifugally projecting dust from the air,

2. A dust removal device comprising a casing having a separator compartment and inlet and outlet openings for air, meansbetween the openings for deflecting the air stream to dynamically having a series of -eov project dust from the air stream into an inactive portion of the compartment, means to dene an areaway between the deecting means and such inactive portion of the compartment, and curved battles in the areaway to induce a swirling motion of the air returning from the inactive portion of the compartments and thereby cause a further centrifugal projection of dust from the air.

3. A dust removal device comprising a casing having a series of communicating separator compartments into which dust laden air ows at progressively increasing velocities, means in the compartments for deflecting the air stream, thereby causing dust to be cast dynamically from the air stream, means dening an areaway in the final stage compartment to conduct air and dust in one direction, and a series of baiiles in the areaway having curved portions to induce a swirling motion of air flowing in a counter direction and a consequent centrifugal projection of dust therefrom prior to the passage of the air from the nal stage compartment.

4. A dust removal device comprising a casing communicating separator compartments into which dust laden air ows at progressively increasing velocities, means in the compartments for deflecting the air stream, thereby causing .dust to be cast dynamically from the air stream, a series of baliles arranged in pairs at diierent elevations to define a pathway for the air and dust entering the final stage compartment and having curved portions to induce a swirling motion of air owing in a counter direction to the incoming air and a consequent centrifugal projection of dust therefrom prior to the passage of the air from the nal stage compartment, a ltering compartment in Ithe casing, and a ltering element in the ltering compartment for straining the air issuing from the nal separator compartment.

5. A dust removal device comprising a casing having separator and filtering sections, a wall separating the separator section into initial and final stage separator compartments and having an opening through which dust laden air ows from the initial stage compartment tothelnal stage compartment, a nozzle forming a continuation of the opening and having a restricted portion to accelerate the velocity of the air and dust iowing therethrough, means for deecting the air entering the compartments to eiect centrifugal projection of dust to the bottoms of the compartments, means in the final stage compartment to cause a swirling motion of the air for further projecting dust from the air, an ou let opening of greater area than the restricted portion of the nozzle to conduct air and dust from the nal stage separator compartment into the filtering section at comparatively low velocity, and a filtering element in the filtering section to strain the residue of dust from the air.

TI-IEODORE F. HATCH. 

